/etc/postfix/main.cf:
  file.managed:
    - source: salt://postfix/files/main.cf
    
/etc/postfix/virtual:
  file.managed:
    - source: salt://postfix/files/virtual
    
postfix-service:
  service.running:
    - name: postfix
    - enable: True
    - reload: True
    - listen:
      - file: /etc/postfix/main.cf
#postmap /etc/postfix/virtual 
#postfix reload